Time-dependent changes in rat hippocampal synapsin I mRNA expression during long-term potentiation.
We studied the time-dependent changes in synapsin I mRNA levels after hippocampal long-term potentiation (LTP) in rats in vivo. Following LTP induction by stimulating the perforant path, synapsin I mRNA expression in the granule cell layer of the dentate gyrus ipsilateral to stimulation increased significantly in a time-dependent manner. From 2 to 8 h after stimulation, the synapsin I mRNA levels in the ipsilateral dentate gyrus were significantly higher than those of controls subjected to a sham procedure. The synapsin I mRNA level (157.4+/-7.1% of the control level, mean+/-SEM) was at a maximum 8 h after stimulation. The synapsin I mRNA level of animals that received only test pulses did not increase significantly, compared with the control level. These results suggest that the increased level of synapsin I mRNA is related to persistent enhancement of synaptic activity within the neural networks in which dentate granule cells participate in LTP.
Morimoto
K
K
Department of Neuropsychiatry, Faculty of Medicine, Kagawa Medical University, Kagawa, Japan.
Sato
K
K
Sato
S
S
Yamada
N
N
Hayabara
T
T
D000818:Animals; D006624:Hippocampus / Q000378:metabolism*; D017403:In Situ Hybridization; D017774:Long-Term Potentiation; D008297:Male; D012333:RNA, Messenger / Q000096:biosynthesis*; D051381:Rats; D017207:Rats, Sprague-Dawley; D016704:Synapsins / Q000235:genetics*; D013997:Time Factors
D012333:RNA, Messenger; D016704:Synapsins